Apple Roof Cleaning Tampa Florida strongly suggests that Tile and Shingle Roofs should never be pressure cleaned. Pressure washing damages your shingle roofing by blasting away the granules, and this crude and invasive method of cleaning doesn't really kill all of the algae growths. Typically roofs that have been pressure washed here in Tampa, will need to be cleaned again in as little as one year, depending on the amount of rainfall. Besides ruining your shingle roofing, all pressure cleaning does is scatter the still living algae from your tile, metal, or shingle roof all over the place